#include <iostream>
#include <chrono>
#include <thread>

int main(){
    auto start = std::chrono::system_clock::now();
    std::this_thread::sleep_for(std::chrono::milliseconds(2450));
    auto end = std::chrono::system_clock::now();
    auto int_s = std::chrono::duration_cast<std::chrono::seconds>(end - start);
    auto int_s1 = std::chrono::duration<double>(end - start);
    auto int_s2 = std::chrono::duration<double, std::milli>(end - start);
    std::cout<<int_s.count() << ", " << int_s1.count() << ", " << int_s2.count() <<std::endl;
    
}
